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You're getting mixed up on some Java concepts. Here's some clarification (hopefully). In Java, when you pass a object instance as a parameter it is accessible by the method. It is not a copy. This differs from some other programming languages. Also, when you use the assignment (=) it does not make a copy. So if you say Object A = B and then change something in A it will also change in B. To make a copy in Java, you have to go to explicit work to make the copy. It is good programming practice with your custom classes to create a proper copy() method. To make a copy the basic idea (there are other "levels" of copying) create a new instance and go through an find all the primitive fields and copy their values over. Generally, you'll only get a copy if a new instance is created. Otherwise it is passed on through. Passing through is how method "chaining" works (allowing you to take the returned value and apply additional methods). For example, if you have a method that takes in an ItemStack and then returns it, it is the same instance. But if the method takes in the ItemStack, creates a new ItemStack and returns that then it would be a copy. Now the other Java concept you need to understand better is interfaces. You also said: That is only partially right. You get the whole instance but are only guaranteed that it supports the interface. However, if you have confidence that it is actually a certain class type you can access its methods too. To check if something is actually a certain class you can use the instanceof operator and then cast. Like there are many methods in modding that have a EntityLiving passed in, but you can check if it is actually instanceof EntityPlayer and if it is then cast it to EntityPlayer and then you're allowed to access the rest of the EntityPlayer methods.

Its not. It would not make any sense for it to be.

I do know that https://ore.spongepowered.org/Erigitic/Total-Economy is one.

SOLVED! Thank you so much, I have struggling with this for a week and it is finally working!